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请教关于带通滤波器取3次谐波的问题



我想从10K的方波中取出3次谐波,一直没仿真出来,也焊了很多电路,,波形不对,,,想问这滤波器的参数怎么确定,电容电阻的取值如何确定,我也找了一些计算的软件,可是都仿真不出来,,,,求大神指点啊!!!!!!!